2019-2020学年人教版英语选修六课件：Unit 4 Period One

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1、The Arctic will soon be free from ice，experts say.The change is sure to take place，but global warming and climate change are changing the earths landscape(地形) rapidly，causing anxiety worldwide. Experts say that the Arctic sea ice is melting quite faster than expected and it can affect not just the r

2、egion，but Earth in general.A scientist even says that next year，or maybe the year after that，the Arctic will be free of ice.,话题导入,Peter Wadhams，director of the Scott Polar Institute in Cambridge，said，“Most people expect this year will see a record low in the Arctics summer sea ice cover.Next year or

3、 the year after that，I think it will be free of ice in summer and by that I mean the central Arctic will be ice-free.” “You will be able to cross over the North Pole by ship，” he added. Wadhams study says that melting sea ice will have a great influence on the planet since the sea ice is more capabl

4、e of reflecting(反射) sunlight compared to water that can only reflect 10% of the sunlight.Once the sea ice melts，the water can only reflect a small amount of sunlight.This means that the Earth will receive and absorb more sunlight，making the planet even hotter.,The year 2016 had already broken record

5、s of the hottest temperature ever recorded and the trend doesnt seem to show any decrease in global warming.“It doesnt look like the ice is healing and growing back，” Tom Wagner，NASAs manager said in a report. Like Wadhams，scientists and researchers all over the world are lecturing around to educate

6、 people to help lighten global warming that has already changed the planets landscape.,判断正(T)误(F) 1.The speed of the Arctic sea ice being melting is beyond expectation.( ) 2.The Arctic wont be free from ice soon because of global warming and climate change.( ),查看答案,T,F,PART 1,读前清障,PART 2,课文理解,Period

7、 One Warming Up & ReadingPre-reading,PART 1,读前清障,1.consume A.n.燃料 2.random B.vi.同意；捐赠；订阅 3.phenomenon C.vt.消费；消耗；耗尽 4.subscribe D.adj.胡乱的；任意的 5.fuel E.n.现象,查看答案,匹配左边的单词与右边的汉语意思 第一组,6.quantity A.vt.反对；反抗 7.oppose B.n.量；数量 8.state C.n.大灾难；浩劫 9.trend D.n.趋势；趋向；走向 10.catastrophe E.vt.陈述；说明,查看答案,第二组,11.r

8、ange A.n.洪水；水灾 12.consequence B.n.旱灾；干旱 13.mild C.n.结果；后果；影响 14.flood D.adj.温和的；温柔的；淡的 15.drought E.n.种类；范围,第三组,查看答案,16.famine A.vi.趋向；易于；vt.照顾；护理 17.data B.n.资料；数据 18.byproduct C.n.化石 19.tend D.n.饥荒 20.fossil E.n.副产品,查看答案,第四组,PART2,课文理解,Step 1 Fast-reading Skim the text and do the following exercis

9、es. 1.This article may be from . A.an environmental magazine B.a diary C.a novel D.a story,查看答案,2.Find out the main idea of each paragraph. Para.1 A.the cause of the earths becoming warmer Para.2 B.the consequence of burning fossil fuels Para.3 C.the increase of carbon dioxide Para.4 D.global warmin

10、g will go on Para.5 E.puzzles about global warming Para.6 F.different attitudes to global warming Para.7 G.an introduction to the passage,查看答案,Step 2 Careful-reading Read the text carefully and choose the best answer. 1. made accurate measurements of the amount of carbon dioxide in the atmosphere fr

11、om 1957 to 1997. A.Dr Janice Foster B.Charles Keeling C.George Hambley D.Sophie Armstrong,查看答案,2.Some scientists like George Hambley think that the temperature increase will . A.cause a rise of several metres in the sea level B.cause the spread of diseases and the disappearance of species C.encourag

12、e a greater range of animals D.cause severe storms，floods，droughts and famines,查看答案,3.The main difference between Dr Janice Fosters theory and George Hambleys lies in . A.how to prevent global warming B.what causes global warming C.whether global warming would cause serious problems or not D.whether

13、 the levels of carbon dioxide have increased or not over the years,查看答案,4.Which of the following is TRUE according to the text? A.Greenhouse gases refer to some byproducts of the burning of fossil fuels. B.Global warming is a random rather than natural phenomenon. C.The temperature in the last centu

14、ry increased by as high as 5 degrees. D.Fewer greenhouse gases will gather in the atmosphere.,查看答案,5.The author probably agrees that . A.actually global warming is good for man B.we should do nothing about global warming C.catastrophes will happen if the globe keeps on warming D.a lot remains to be

15、found out about the effects of global warming,查看答案,Step 3 Post-reading After reading the passage，please fill in the following blanks. There is no doubt 1. the earth is becoming warmer and that 2. is human activity that has caused this global warming. Many scientists like Dr Janice Foster believe tha

16、t people have caused the increase in the earths temperature by 3. (burn) fossil fuels like coal，natural gas and oil to produce energy whose byproducts 4. (call) “greenhouse” gases，the most important one 5. (be) carbon dioxide.,that,it,are called,being,查看答案,burning,These gases trap heat from the sun

17、and therefore warm the earth，without 6. the earth would be about thirty-three degrees Celsius 7. (cool) than it is.But increased amount of extra carbon dioxide means that more heat energy is trapped in the atmosphere 8. (cause) the global temperature to go up. 9. the other hand，scientists like Georg

18、e Hambley believe that any warming will be mild with few bad environmental consequences and more carbon dioxide is 10. (actual) a positive thing.,which,cooler,causing,actually,查看答案,On,Step 4 Sentence-learning 1.There is no doubt that the earth is becoming warmer (see Graph 1) and that it is human ac

19、tivity that has caused this global warming rather than a random but natural phenomenon. 句式分析 本句中There is no doubt后接了两个that引导的并列的同位语从句；第二个同位语从句中it is human activity that .phenomenon是一个强调句，强调了主语human activity。 自主翻译 _ _,查看答案,毫无疑问，地球正变得更加暖和(见图表1)，并且全球变暖是人类活动造成的，而不是随意的自然现象。,2.It means that more heat ener

20、gy tends to be trapped in the atmosphere causing the global temperature to go up. 句式分析 本句是一个复合句。that 引导一个宾语从句；causing the global temperature to go up 为现在分词短语作结果状语。 自主翻译 _,查看答案,它意味着更多的热能将被困在大气层中，从而引起全球气温上升。,3.On the other hand，there are those，like George Hambley，who are opposed to this view and belie

21、ve that we should not worry about high levels of carbon dioxide in the air. 句式分析 本句是一个复合句。there are those，like George Hambley是主句。who are opposed to this view and believe that we should not worry about high levels of carbon dioxide in the air为who 引导的定语从句。该定语从句又分为两部分，由and 连接。are opposed to this view为一部分；believe that we should not worry about high levels of carbon dioxide in the air为另一部分，其中含有一个that引导的宾语从句。 自主翻译 _ _,另一方面，有一些科学家，像乔治汉布利，反对这种观点，他们认为我们不必担心空气中高含量的二氧化碳。,查看答案,